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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bb9628c463e8bc3e9de8965348afea0d6ecdd51a551268a2bd5d6c53609e6d6' 
  AND token = 'pfdyWKekx2+KlIgJHftA3Dg6y/jtwmtYIIeA1JX/OIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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