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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2b002ad04830e54f9ff9b6fec523c3d8aa02a06438811cf2c3efea0f5b604f1' 
  AND token = 'WE1rD+Xz0ca4x93ktIJow/5MgknDWlhD+QUb7a9I7DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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