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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c503d2f7a2fd58f57fca40f057fdc00c7c98d4eef8ea6de643d25f4c62f93177' 
  AND token = 'l2eEQ7uSoPeZLo6lZS927R12wceumRORGsyxPhzs84w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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