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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb0657bf0373502c10c86d7d9fc7cf4fdc283cd8bd012ede78a821801d46128' 
  AND token = 'n9qU5s5tM8L5BRqcb0INmMy0cuNgYlTlHg8bLVzMCdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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