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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5cf64de9c22a34c4f8a2c0ec1d138948e23e0d8eb79a956d450d2a5c1f68d52' 
  AND token = 'dk4T5/OLqetAGKWMpEsBMLEIrvAjuGVzYq8o3D9ouCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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