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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca0d05a8fa1cc9584b5e6789e7c78c11cbbced98cb94cf89266137b4973fc36' 
  AND token = 'SUJaJwyQ/5igLs5ya4DuKGX8C8538P4DFGymQ49syUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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