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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf261e0b1241149fbc9120e59eb1ccdacbb8591d32bca7c56b15c26da00ed558' 
  AND token = 'KhYxx2c828NuM6tTvSgxNRfI+mKZ2OeS7M4vJBLBhEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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