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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1d3590a16e9975adc82270b092d3d89ea6eec01da8b9a7f52faf19885f8c654' 
  AND token = '9hLnqM5Eiy2Z1U0u4VPrpmNv22pk+3ri/rscFWjLFCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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