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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c0e3ac91356ddeb0f6940ce53bce2d4bdb5e304c097b36b55d64ef9038500c' 
  AND token = 'NjFZG8ADwe4sABj3dXzAzsemfwu1AKrP+a87T5bI6zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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