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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cc231a8ba91c1dd733b68546b0a2f427204526890cd1673fab7a9968eeaa9c5' 
  AND token = '1LpeG/L9zLwmnqRsJbeur7RtAjHkFnebQyedpQ20Q/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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