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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8edb803bcffd782a7969af751eb7ad199fdaa070e2e4cada85ea92471aa1000' 
  AND token = 'i0NY8vZH6++/Insj4MM79tA47JTZGLLzrLYPlZwn2gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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