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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fdebe15e8b28fe8df1abefee2bb12455ab85bf4fce19d95c31524a510ca8cea' 
  AND token = 'SVYojI+gSfUlG8v5+8U4QQVPoZx53+hxad8dFr4EVc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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