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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba24197d955d0013a27a72545f1a02969602f4a45c5369ae1c9f19098531ef37' 
  AND token = 'RFiV/DEzeHDqo8dB2maRkUY7XT877dOppxudes9IUzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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