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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae68a0688ccd4242199d85f8e84707535a652115078ef0afc2472a1144fab03e' 
  AND token = '9JltE98624iG0gc5g7vkcxX7t9op9KQrxeW6lhurANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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