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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '797a608b4b518962f9427563d1fca73baaa9b296a4eb581a18e9ee9380b27e58' 
  AND token = 'Dy9oX3yFv+Okfd7znfG9lSXhls6H6EwTdvtznmOdDIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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