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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc426b5b38fd270775036ed24f2fe2ff2a456706a494e224c2f1a274f50a7728' 
  AND token = 'K+rFhz5KC8aKTa7iMqBowdFPZcjxtLqX84qzDbNoP0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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