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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80976ac7bf96189754d9ed0cec2e014a4324ed4217c569cf13f4d16a863f13b0' 
  AND token = 'n823jdc5TRCeRy+krn2GTswIRyOMesaOekMsXr0GMJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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