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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab283c8ab3e1d96e87562b22ef8eb87d202432850f51927412608c89669fd7c0' 
  AND token = 'xhD6OMVnELdkimGEciJdTziNghS5MbId6uS0ROpLYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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