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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5291efa5c2877388e778f0fd88fdbd4b3af58e8c76e42ee52cd8bd9a65a4bb57' 
  AND token = 'vMjZzHO7x4SvtTZI5+srygHymg3B7+WI3q12l3e8Puo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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