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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '423fc138525fce2d87d4d76d8a312fa941e07ab79978bffcc33cc47c223dc25a' 
  AND token = 's3oMw1c6s0cE+by5lDk6/5zUPDawoNJuotJzkYbxEAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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