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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19f3b49e90e98ddcb838608f9c847a375ba1258da5eb059ed389e63c9b0574ce' 
  AND token = '4+nEfy9TRiEx0hDoLWYJ1OQp0mG2hLvmJTVW7Eh2MIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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