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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c6927870f449903cea66f14590212f80124c1a3cddb111314502ea7e5db1cf9' 
  AND token = 'rPqSbYVGFxCogAR45oA8ft/dxG4slCe3ds1HDGzN2AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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