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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7912251329e4ce1e95fad6a717053f7e28a17ba930b21817a44b688249bc8f2' 
  AND token = '7Ym7VYPtldmALFQlOeJBolY0xkz0wjuOgJr1DXXSmTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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