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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e67d16523a9504a7f3d58d8b95a5d73134e2526dd80ad79fe40fc9fe77b38f0' 
  AND token = 'X0bvRxqA5NbP99AABRYn00PTmMKTaeJzMbWWN+aX9i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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