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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b160de81084961678b2323abe0fe78f2b9784fdd521ff905ba808a010367cc68' 
  AND token = 'jatD5+7mFMLQL2E5260a+MTr6ZVbnsyGV2PgBfPSED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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