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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f51c80ba901e73eb141dd9e2ffa4c56c74912d66d6c637e41fc71f6e65a4dfb' 
  AND token = 'RDM3+iSRQCKv05ygrGGubBGAgyVRaabOBybywvzUfIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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