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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56f8b61dfbfdddf5f408d9b81a6e29fb4c08ef021d26e7597f852224aacb9097' 
  AND token = 'iX/oe+Ms4EnDWuQ5HWSuD76Ilv2Q2jjdhJzOAz0aHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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