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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1bec7c6a84f4c07201dbd3dbb53105e2fc108a0031b26b66a2c0801f3481dd9' 
  AND token = 'bardpEphQNPtSpSuGIub/biADc2EXaCD7T3/j9/lTUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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