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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ec38e9647d4c01128e6eb352a7e38bc025d35acefacc92effcef9de38d6480' 
  AND token = 'MH1hLIyyMf8zLMhSyN1T9yxVw5oBXLhFpMLNIBYesXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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