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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f40f7bb13e54dd4ba4f842e5089737cf6df5e384cfc5f515c32ef77c4cfcaddc' 
  AND token = '0gQk8iWKUL1PWWYxcxlS9XOEKLI4oZmqW6UM3AB5i2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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