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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8521cbcbe56c5d9ff55fbfe37d619106d55db0b2f6f9d9f996c7ff2e44c6452' 
  AND token = 'i8m3OrMaIfE/7szkP0KoNPcU32rWKYjkh7DO/mxuTXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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