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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '092d8c8e52c07ade5579d50d57970044d2d5315f7f69a032dd9f78c0194e8bfe' 
  AND token = 'OiHQEpaap3ikiX+VWYcejdkwRshZnGTNJ8Ca9eQwIRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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