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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d44d4a880950d902b9583db08dd5ba0a7a309e4e5d2da10699d2c68531a6ba1' 
  AND token = 'OUcxNNm2OkUUq56rP9R/AuoeXGptUfNOaFXzPukERro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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