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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c69408ab84877ede4e24f78144b78354a67ae81a9627c023ba52fce2fde43225' 
  AND token = '9TEcH3GPc0xBc+XUpua2VgdoMuxaXS5WggILhqXhkcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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