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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '042c4b07a2f556a2f14c053b5d1da53f56cb582b62aafe9d823aeb3d3e4fbbbf' 
  AND token = 'M/Oa+rLWnYgjU+wG3WPU4tUi5n/oNrhuviacOGiBcHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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