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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d9c8d4597178037ec6e5f04a3f19a1799d8745e0e697104e6819d31434af836' 
  AND token = '8EekN4/rsR3bF8VJkWeADR2D68F10pijdbHwnnUmK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}