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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e5d670864aa20faf964b2f72aebadd14bd9d8cd445f8a02caceb29f5597327' 
  AND token = 'c9TOJssARqnaxF8Qil2mqPtmzhcBMfM64qafem3xHYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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