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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f38385323927462bb1587cd4da3959e3ad78303fb4d0fded6b515d32e4eaab' 
  AND token = 'SQG0S70L0jTvXFEcsQrbchLKgj34EdmwSFMH5TPPBPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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