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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6ee386445b7caf3bf7b89a103a95787234e8ebf804007e46e24eb7a44e19fc0' 
  AND token = 'FH+emmY/3U42HjbZrnpMHoH6Vi96ZPL6WgiO7UG5gBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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