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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d41de0739a124b59d2222be15244bf5cb2bc4cf4c5374fecf87b5bb9b6faa9' 
  AND token = '6KFKnezRTqg8wPdmwkAFFSc0bWDUlm4undryz/BrPFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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