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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5810ee7beb5ff4494f9de8c407c86b6e08ff7fb27701835a53e37bdde5629ba' 
  AND token = 'eexAAekU1aEC4QF8hJExedTC7ZnLPeCGGg5i+/5eopw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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