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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08ee8a8bc9b18d052bfa1d43483e767c3d8bde6bbd5c3120e748062576f2a9c9' 
  AND token = 'pM9MTCNt/sx1oaQQw23o09Or6mY6RVXkXp8Kp/OPfKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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