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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364aaed6f26849556a02b5f268b4caa3cc85ae553d11d172f176733ea3dc7ecc' 
  AND token = 'gq1hOF1KSq+niM286iwqfkpsOMIjU0DzoSNG2IJUcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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