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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64e168e9e4de96206f96c7eb8bdc17f3825c67bfa1ec8ffb7802ec889cce9c8f' 
  AND token = 'hEnLFX80piA3LmX6fFZk0Tig5jkvkDL3XwDYSD1LqlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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