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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e87563e5fdbd4c92b137a6a18e5b52faf8c678da6803336e37636aafafcc589' 
  AND token = 'b9GvM67BIPxZc8Q5ZvpRZdVp2rv+wvQYbXpxC9ktwcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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