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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '977137812c7b276bb7f4fde2e14e7f3ea9970b1574f54e73594baa0c22902ee4' 
  AND token = '57VJmmn/v7YIick0aVmTpECkzzaiBguv4YLt75NjsxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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