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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6011e4ada76e98ace039c9369b2ab73a474e6e851e9dd3e510ed7d0ad475418a' 
  AND token = 'eZF23wrW5VU0rPjYYka1sceOtLJ/VsdEO5u74nRrBlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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