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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3967c3fec4f984d0e038b04bc7cf55c4b60a1b776fec434fc8856d15ca08e101' 
  AND token = 'T+ID3FpA1KK8GdulHsNgvcTOA/LOFEZZaxcZedHD/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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