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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ba01b544170fdac89efab1f3be3d27e24996bf8f0190dcfee54e44afe219f75' 
  AND token = 's/EvFg1p8i4Lr80MbvjM/YZXZum0y+1Uq1adDTwSNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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