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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcdeddf6eef1a4254e06fa4a91c2e6cdfadfd5c71140a92931408a1deb42c4e8' 
  AND token = '5k3Nee9LmzEMip6vWzHG+9Y2jymmpA7N6Lr1x0vGAhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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