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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58dedc42bc0ed24626968aab39d0bc405f6f5d9668839a0207ed52e9a27f44e0' 
  AND token = '7OGSuJpm3La05mq8tta56xfsbblny5MWwNX43El/3lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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