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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe2c5babb65242576dbe07b44c4dba04d3522c30dc4da6706f860e25a82cc110' 
  AND token = 'DGfhN0LNYImQe4jMfMQHT40uSUW3cp/F+BSIuhzqrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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