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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd4e1d233bbaa9ec64fbd39ffcaf92c0f5a2b58f1b75ce290f3f0e93286ddbe' 
  AND token = 'MN+5zbrNoiiuYOmZ/Dj+gN8F9k7m+3o7ARg+aqpKJ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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