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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4518b896ad1e15d69575106cdcb9f2061684fdd5e1ec2ddf2a7e3b83b8595929' 
  AND token = 'F0fkjayevOWYhNW6VO4fot2d0MVp2sgGFtkQ7Rh4Sqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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