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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4827bc48b142f26cde9b99e2e117f24b6ff29f00070bc5ca0477f296ce5121ce' 
  AND token = 'bK1BOaMAOfTxzmh4hY34Hyz7iS8c5Ss6vPufT639m8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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