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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e29b03d84dacd4c4bb0c6328eb76de8a49074a8a63689f268ea0e2236cbaf8' 
  AND token = 'Zf5mTrKo/O8O02Dk2sCI4UcF+L6vZ9e3MmSmpswH2pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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